CVE-2003-1029
Description
The L2TP protocol parser in tcpdump 3.8.1 and earlier allows remote attackers to cause a denial of service (infinite loop and memory consumption) via a packet with invalid data to UDP port 1701, which causes l2tp_avp_print to use a bad length value when calling print_octets.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Tcpdump 3.x - L2TP Parser Remote Denial of Service
source: https://www.securityfocus.com/bid/9263/info
A vulnerability has been reported to exist in the software that may allow a remote attacker to cause a denial of service condition in tcpdump. The issue presents itself when an attacker sends a maliciously formatted packet containing 0xff,0x02 bytes to UDP port 1701 of a system running a vulnerable version of tcpdump.
This issue is reported to affect tcpdump 3.7 and prior running on OpenBSD 3.3 and -current, however other versions on different platforms could be affected as well.
tcpdump -i lo0 -n udp and dst port 1701 &
perl -e 'print "\xff\x02"' | nc -u localhost 1701
Example packet data has been provided by Balaram Amgoth <ramgoth@yahoo.com>:
char packet[] = "\x82\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 3.8.3-1 |
| sid | Fixed | 3.8.3-1 |
| forky | Fixed | 3.8.3-1 |
| bullseye | Fixed | 3.8.3-1 |
| bookworm | Fixed | 3.8.3-1 |
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.